Cancer patients should focus on consuming a variety of nutrient-dense foods to support their health. Key food groups include: - Fruits and Vegetables: Rich in vitamins, minerals, and antioxidants, which can help strengthen the immune system. - Lean Proteins: Essential for tissue repair and maintaining muscle mass. Sources include poultry, fish, eggs, beans, and legumes. - Whole Grains: Provide important nutrients and fiber that support digestive health. - Healthy Fats: Found in nuts, seeds, avocados, and olive oil, these fats are important for overall health and energy.